Nuaire Group MRXBOX95B-LP1EH Installation And Maintenance Manual

1.0 Introduction

The unit must remain switched on at all times to maintain
ventilation within the dwelling. Turning the unit off will
cause long term damage to the unit and building fabric.
This appliance is not intended for use by persons
(including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction
concerning the use of the appliance by a person for their
safety. Children should be supervised so that they do not
play with the appliance.
MRXBOX95B-LP1E ceiling void mounted unit is designed to
provide mechanical supply and extract ventilation with heat
recovery, summer bypass, integral humidistat and compatible
with Ecosmart controls, sensors and remote commissioning
feature.
The unit is fitted with two independent fans. Each fan has full
speed control for background and boost ventilation rates.
To recover heat from the extract air the heat exchanger block
is utilised. The heat exchanger can recover up to 80% of the
normally wasted heat.
The bypass damper opens automatically via a wax actuator when
the outside air reaches 20°C, when the outer air temperature
returns below this level the unit returns to its original state.
Outside air supplied through the bypass is still being filtered,
so the air quality is optimal, irrespective of the bypass setting
(open or closed).
The unit is fitted with a frost protection mode, in the event of the
fresh air temperature dropping below -5 Deg C the supply fan will
switch off. The unit will then automatically switch back on when
the temperature raises back above -5 Deg C.
Figure 1. Airflow through unit.
Spigots 1 to 4
1. Intake air (Fresh Air from outside).
2. Supply Air (Supply in to house).
3. Extract Air (Warm air from house).
4. Exhaust Air (Waste air to outside).
Spigot 3.
Spigot 2.
Note: The unit must be installed in an upright position as
shown for the condensate drain and for compliance with safety
regulations relating to IP protection for water drip ingress.
Nuaire Limited Western Industrial Estate Caerphilly United Kingdom CF83 1NA
T: 029 2085 8400 F: 029 2085 8444 E: info@nuaire.co.uk W: www.nuaire.co.uk
MRXBOX95B-LP1EH
Mechanical Ventilation Unit with Heat Recovery,
Summer Bypass & Integral Humidistat for Ceiling Void
Mounting. Compatible with optional Ecosmart Controls.
Installation And Maintenance
Spigot 1.
Spigot 4.
1

2.0 Installation

Installation must be carried out by competent personnel in
accordance with the appropriate authority and conforming
to all statutory governing regulations. All mains wiring must
be in accordance with the current I.E.E. Regulations, or the
appropriate standards. Ensure that the mains supply (Voltage,
Frequency and Phase) complies with the rating label.
Please note a clear working space is required around the
installed unit to allow the cover to be removed and provide
sufficient access for maintenance such as filter change.
The fan must be installed indoors, in a suitable ceiling void
away from direct sources of frost, heat, water spray or
moisture generation. For a vibration-free result the unit must
be mounted to a solid surface in the void.
The unit is designed for ceiling mounting only (Horizontal
surface).
1. The unit is supplied with a steel mounting bracket.
2. Position & secure the steel bracket to the ceiling using
appropriate fixings (supplied by others), ensuring that the
two outer fixing holes on the unit are accessible.
Note: The mounting bracket should be on the same side as the
condensate take off.
3. The unit can now be offered into position & located into the
mounting bracket.
4. Using appropriate fixings (supplied by others), fix the unit to
the ceiling. It is recommended that the unit is fixed through
three holes on the non-bracket side and the two outer holes on
the bracket side.
Figure 2. Installing the unit using appropriate fixing bolts.
Steel mounting bracket
Figure 3. Typical side view example of a unit mounted in a ceiling
void using 204 x 60mm rectangular ducting and air valves.
204 x 60mm
ducting in
ceiling void.
Air valve
in ceiling.
The EMC Directive
2004/108/EC
The Low Voltage
Directive
2006/95/EC
Side view of unit
mounted in the ceiling void.
05. 09. 13. Leaflet Number 671632